PARTY PRIORITY

KIRSTEN Dunst celebrated her birthday at West Village nook Beatrice Inn Monday night after bailing on her “Spider-Man 3” screening in Astoria. “She told everyone she was sick and left right after the red carpet,” said a Page Six spy, “but really she went to her birthday party.” When the 25-year-old actress stumbled out of the bar, paparazzi scrambled to get photos of her feet, which were covered with a red, splotchy rash. Reps for Dunst did not return calls.